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Old 14-01-2018, 20:12   #1
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Yanmar 3GM30 27hp

Aloha! Newbie from Oahu. Is 3500 hrs a lot on an original 1990 Yanmar 3GM30 27hp ?
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Old 14-01-2018, 20:13   #2
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Re: Yanmar 3GM30 27hp

It depends on how it's been maintained. If done properly, it could go 10,000 hours.
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Old 14-01-2018, 20:30   #3
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Re: Yanmar 3GM30 27hp

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It depends on how it's been maintained. If done properly, it could go 10,000 hours.
Thanks for the reply. I thought that was the case as I have heard they are pretty good engines.
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Old 14-01-2018, 21:06   #4
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Re: Yanmar 3GM30 27hp

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Originally Posted by davenrino View Post
Thanks for the reply. I thought that was the case as I have heard they are pretty good engines.
This is the engine I have and I love it. Could imagine you easily going another 3500 without a single problem except for maybe changing the exhaust elbow. Just keep on the regular maintenance and check oil/coolant frequently. Push it from time to time under high RPM load to blow out any unburnt carbon. A cool trick I learned is that if the key on the panel doesn't work one day (do you know there are fuses on the engine for the starter?) then you can take a quarter and it is the exact size to bridge the gap between the alternator and starter. It jump starts right up
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Old 14-01-2018, 22:07   #5
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Re: Yanmar 3GM30 27hp

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Originally Posted by gamayun View Post
This is the engine I have and I love it. Could imagine you easily going another 3500 without a single problem except for maybe changing the exhaust elbow. Just keep on the regular maintenance and check oil/coolant frequently. Push it from time to time under high RPM load to blow out any unburnt carbon. A cool trick I learned is that if the key on the panel doesn't work one day (do you know there are fuses on the engine for the starter?) then you can take a quarter and it is the exact size to bridge the gap between the alternator and starter. It jump starts right up
Thanks for the info!!
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Old 14-01-2018, 23:00   #6
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Re: Yanmar 3GM30 27hp

Barely broken in. If it's raw water cooled it's important to check the anodes every twelve months or so and replace them. I had one for about 25 years and replaced it because it was not enough horsepower for the boat. We used it to drive a hydraulic pump and ran it at full throttle every day for three weeks and it never missed a beat.
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Old 14-01-2018, 23:46   #7
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Re: Yanmar 3GM30 27hp

I had a 3gm30f,terrific engine. 3500hrs is nothing, I've seen them with 10,000. All diesels should have decompression valves like yours has.

They are simple easy to work on engines.

Exhaust elbows are a problem, also oil pressure line can rust out near starter. The bleed screw on the filter will eventually chew the thread out, don't use it, bleed at the injector pump, gearbox yellow dip stick can break off and probably will.

Google 3gm30f starter relay. Add a relay to the system if someone hasn't already done it, easy job and you'll never have a problem when you press the button.
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Old 14-01-2018, 23:47   #8
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Re: Yanmar 3GM30 27hp

I'm assuming that it's similar to the the F?
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Old 14-01-2018, 23:52   #9
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Re: Yanmar 3GM30 27hp

[QUOTE=daletournier;2555737....also oil pressure line can rust out near starter. The bleed screw on the filter will eventually chew the thread out, don't use it, bleed at the injector pump, gearbox yellow dip stick can break off and probably will.

Google 3gm30f starter relay. Add a relay to the system if someone hasn't already done it, easy job and you'll never have a problem when you press the button.[/QUOTE]

Yes, absolutely these, too. Great suggestions. I had to do the same with mine at 7000 miles on nearly a 30-year boat.
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Old 15-01-2018, 00:08   #10
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Re: Yanmar 3GM30 27hp

Rather than introducing a relay and adding a bunch more wiring. One thing I've seen is to just replace the white wire from the button to the started to with a good gauge tinned wire eliminating all the quick disconnects which where corrosion usually starts.
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Old 15-01-2018, 05:23   #11
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Re: Yanmar 3GM30 27hp

Greetings and welcome aboard the CF, Dave.
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Old 15-01-2018, 07:36   #12
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Re: Yanmar 3GM30 27hp

Watch out for air filter. It's known to crumble and for the engine to ingest it (with no ill affects). It's joked that about 50% of marine Yanmars must just be running on the metal gauze. Some replace the airbox (which is handy for rusting from the inside out) with a K&N style filter. Others can't stand the noise.
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Old 15-01-2018, 07:55   #13
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Re: Yanmar 3GM30 27hp

I am close to 3500 hrs on a 91 3GM30F and runs like a top. Change fluids regularly and 4 years about max on the mixing elbow. 3 years into a 316 SS replacement (mixing elbow not engine) that I found on ebay and plan on an inspection next Winter to access if the SS is really a better mousetrap.
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Old 15-01-2018, 08:26   #14
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Yanmar 3GM30 27hp

I donít understand the jump start from the alternator?
I have always gone from one stud on the starter solenoid to another.
Plus use something big enough to give you good leverage to break it free, sometimes when you jump start, it spot welds whatever you use as there is a whole lot of amps going through it, a spot welded quarter may be tough to remove.
However if that happens, donít hurt yourself trying to remove it before the starter grinds itself to death, go instead to the battery switch and turn the batts off, and deal with the quarter at your leisure.
Of course a remote starter switch is best, maybe one day I will remember to get one
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Old 15-01-2018, 08:30   #15
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Yanmar 3GM30 27hp

Quote:
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I plan on an inspection next Winter to access if the SS is really a better mousetrap.

It is better than aluminum and iron, not as good as bronze. Makes one wonder with as many engines that get ruined, why are they not all bronze?
Mine is bronze, but if it werenít Iíd have a hybrid dry stack one made, the upside down U part is dry and uncooled and covered by insulation, then inject the water downstream. No way water can back up into the engine that way and ruin your motor.
Example, the attached pic is the Nexgen 3.5 KW exhaust, old and new, the old was conventional fully cooled SS and ruined motors when it failed, so they made the new one and covered it with insulation and injected the water downstream.Click image for larger version

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